Browse > Article
http://dx.doi.org/10.5140/JASS.2013.30.1.033

Characteristics of Perturbations in Recent Length of Day and Polar Motion  

Na, Sung-Ho (Korea Astronomy and Space Science Institute)
Kwak, Younghee (Korea Astronomy and Space Science Institute)
Cho, Jung-Ho (Korea Astronomy and Space Science Institute)
Yoo, Sung-Moon (Korea Astronomy and Space Science Institute)
Cho, Sungki (Korea Astronomy and Space Science Institute)
Publication Information
Journal of Astronomy and Space Sciences / v.30, no.1, 2013 , pp. 33-41 More about this Journal
Abstract
Various features of the existing perturbations in the Earth's spin rotation are investigated for the recent and most reliable data by spectral analysis, filtering, and comparison with idealized model. First, theory of Earth's spin rotational perturbation is briefly re-derived in the Earth-fixed coordinate frame. By spectral windowings, different periodic components of the length of day perturbation are separated, and their characters and excitations are discussed. Different periodic components of polar motion are acquired similarly and described with further discussion of their excitations. Causes of the long time trends of both the length of day and polar motion are discussed. Three possible causes are considered for the newly discovered 490-day period component in the polar motion.
Keywords
length of day; polar motion;
Citations & Related Records
연도 인용수 순위
  • Reference
1 Hopfner J, Low-Frequency Variation, Chander and Annual Wobbles of Polar Motion as observed over one century, Sur Geophys, 25, 1-54 (2004).   DOI   ScienceOn
2 McCarthy DD, Seidelmann PK, TIME from Earth Rotation to Atomic Physics (Wiley-VCH, Weinheim, 2009), 1-94.
3 Merriam JB, Tidal Terms in Universal Time: Effects of Zonal Winds and Mantle Q, JGR, 89, B12, 10109-10114 (1984).   DOI
4 Na S, Cho J, Baek J, Kwak Y, Yoo S, Spectral Analysis on Earth's Spin Rotation for the Recent 30 years, JKPS, 61, 152-157 (2012). http://dx.doi.org/10.3938/jkps.61.152   DOI   ScienceOn
5 Petit G, Luzum B (eds), IERS Conventions 2010, International Earth Rotation and Reference Systems Service Technical Note No. 36 (2010).
6 Richardson JD, Paularena KI, Belcher JW, Lazarus AJ, Solar wind oscillations with 1.3 year period, GRL, 21, 1559-1560 (1994). http://dx.doi.org/10.1029/94GL01076   DOI   ScienceOn
7 Rochester MG, Crossley DJ, Earth's long-period wobbles: a Lagrangian description of the Liouville equations, GJI, 176, 40-62 (2009). http://dx.doi.org/10.1111/j.1365-246X.2008.03991.x   DOI   ScienceOn
8 Cerveira PJM, Weber R, Schuh H, The instantaneous Earth Rotation - still inaccessible?, Verm & Geoinfo, 2, 113-120 (2007).
9 Dehant V, Legros H, Hinderer J, Lefftz M, An analytical approach to the computation of the Earth, the outer core and inner core rotational motion, PEPI, 76, 259-282 (1993).
10 Gross RS, Earth Rotation Variations -Long Period. In: Herring T. (ed.) Geodesy, Treatise on Geophysics vol. 3 (Elsevier, Amsterdam, 2009), 239-294.
11 Schreiber KU, Klugel T, Wells JPR, Hurst RB, Gebauer A, How to detect the Chandler and the Annual wobble of the Earth with a Large Ring Laser Gyroscope, PRL, 107,173904 (2011). http://dx.doi.org/10.1103/PhysRevLett.107.173904   DOI
12 Silverman SM, Shapiro R, Power Spectral Analysis of Auroral Occurrence Frequency, JGR, 88, A8, 6310-6316 (1983).   DOI
13 Smith ML, Dahlen FA, The period and Q of the Chandler wobble, GJRaS, 64, 223-281 (1981). http://dx.doi.org/10.1111/j.1365-246X.1981.tb02667.x   DOI
14 Strestik J, Variations in solar and geomagnetic activity with periods near to 1.3 year, Cent Eur J Geo, 2009-1(2), 152-156 (2009). http://dx.doi.org/10.2478/v10085-009-0010-y   DOI
15 Wahr J, Polar Motion Models: Angular Momentum Approach. In: Plag HP, Chao B, Gross R, van Dam T (eds) Forcing of Polar Motion in the Chandler Frequency Band: a Contribution to Understanding Interannual Climate Variation: proceedings, 21-23 April 2004 (European Center for Geodynamics and Seismology, Luxemburg, 2005), 1-7.
16 Wallace PT, Capitaine N, Precession-nutation procedures consistent with IAU 2006 resolutions, A&A, 459, 981-985 (2006). http://dx.doi.org/10.1051/0004-6361:20031539   DOI   ScienceOn